GB2114049A - Method of producing a reinforced toothed belt with fabric cover - Google Patents

Method of producing a reinforced toothed belt with fabric cover Download PDF

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Publication number
GB2114049A
GB2114049A GB08237031A GB8237031A GB2114049A GB 2114049 A GB2114049 A GB 2114049A GB 08237031 A GB08237031 A GB 08237031A GB 8237031 A GB8237031 A GB 8237031A GB 2114049 A GB2114049 A GB 2114049A
Authority
GB
United Kingdom
Prior art keywords
plastics material
fabric
wheel
moulding
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08237031A
Other versions
GB2114049B (en
Inventor
Rudolf Breher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BRECO KUNSTSTOFF
Breco Kunststoffverarbeitungs GmbH and Co KG
Original Assignee
BRECO KUNSTSTOFF
Breco Kunststoffverarbeitungs GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BRECO KUNSTSTOFF, Breco Kunststoffverarbeitungs GmbH and Co KG filed Critical BRECO KUNSTSTOFF
Publication of GB2114049A publication Critical patent/GB2114049A/en
Application granted granted Critical
Publication of GB2114049B publication Critical patent/GB2114049B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/35—Extrusion nozzles or dies with rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/08—Toothed driving belts

Description

1 GB 2 114 049 A 1
SPECIFICATION Method of producing a reinforced toothed belt with fabric cover.
The invention relates to a method of produc ing a toothed belt of plastics material or the like extrudable material with a reinforcing insert in the 70 form of wire or thread extending in the longitudinal direction of the belt and with a fabric cover covering the toothed side of the belt, wherein a mould cavity is formed between a moulding wheel which can be driven continuously and which comprises, at its circumference, an annular depression which is profiled like a gear wheel and which corresponds in cross-section to the belt cross-section to be produced, and a cover which closes the depression over a portion of the circumference of the moulding wheel, and the plasticized plastics material is introduced into the beginning of the mould cavity through a nozzle which can be used for the sealed introduction of the reinforcing insert and/or the fabric cover. 85 In the DE-PS 28 01 604, liquid plastics material and a strip of fabric are introduced into the mould cavity, in order to obtain a finite strand of toothed belt which is covered with the strip of fabric at its toothed side, lrom which a wide piece of flexible tube is subsequently formed by winding and embedding a reinforcing insert applied subsequently, from which piece of flexible tube, endless toothed belts of any belt width can be parted off. In the DE-PS 21 23 902, liquid plastics material and a reinforcing insert are introduced into the mould cavity in order to obtain a reinforced finite strand of toothed belt which can be closed to form an endless reinforced toothed belt of any length of belt circumference by suitable 100 connection of the ends of the belt strand. In principle, it is possible also to introduce a strip of fabric into the mould cavity in order to obtain a reinforced finite strand of toothed belt which is covered on its toothed side with the strip of fabric. 105 In the production of both the above- mentioned known toothed belts, the strip of fabric must be reliliently extensible in its longitudinal direction in order that the strip of fabric in the mould cavity, where it at first covers the grooves between the teeth in the moulding-wheel depression in a hollow manner, can be pressed into the grooves between the teeth in the moulding-wheel depression by the plastics material introduced under pressure. During the introduction of the strip of fabric into the mould cavity, the problem has arisen that the soft and stretchably extensible fabric cannot be guided satisfactorily laterally, so as to run straight and flat into the mould cavity. There is the risk of the strip of fabric taking a course sideways, being compressed 120 at one side of the mould cavity or folding over so that no toothed belt satisfactorily covered with fabric at its toothed side is produced.
The invention solves the problem outlined above, in a production method of the kind referred 125 to at the beginning, in that a strip of fabric, which is resiliently extensible in its longitudinal direction, is wetted, in the substantially unextended state, with a liquid adhesiv& agent which enters into an adhesive connection with the plastics material and which hardens through drying and softens again at the plasticizing temperature used for the introduction of the plastics material, and that, after the drying of the applied adhesive agent, the strip of fabric is introduced into the mould cavity and laid on the teeth of the mouding-wheel depression and is then made resiliently extensible by meeting the plastics material entering through the nozzle, and heating and again softening the adhesive agent, and is pressed into the grooves betwen the teeth in the moulding-wheel depression. As a result of the dried adhesive agent, the strip of fabric becomes so stiff that it is guided satisfactorily laterally, in a straight line and lying flat, and can be introduced into the mould cavity. Only in the mould cavity is the stiffness counteracted again by the process temperature acting thereon, so that the strip of fabric is resiliently extensible as before the application of the adhesive agent and can be pressed down completely into the grooves between the teeth of the moulding-wheel depression by the plastics material. A further advantage of wetting the strip of fabric with the adhesive agent consists in that the strip of fabric is protected from fraying at the edges of the fabric on the finished toothed belt and that a web of fabric of ordinary commercial width can be provided with the adhesive agent, for example by immersion impregnation and subsequent drying and after that, because of its stiffness, can be cut very easily into strips of fabric with the strip width precisely fitting the width of the mould cavity, with straight cut edges protected against fraying. As an adhesive agent for wetting the strip of fabric, the same liquid adhesive agent may be used, for example, as is generally used for wetting the surrace of reinforcing inserts of metal wire in order to increase their adhesive connection to the plastics material.
On example of an embodiment of an apparatus for carrying out the method according to the invention is illustrated in the drawing and Figure 1 shows a diagrammatic illustration of the apparatus, Figure 2 shows a detail from Figure 1 on a larger scale.
The apparatus contains a rotatable moulding wheel 1 which comprises, at its circumference, an annular depression, the cross-section of which corresponds to the cross- section of the belt to be produced and which is profiled like a gear- wheel with teeth 2 and grooves 3 between the teeth. The moulding-wheel depression is closed over a portion of the moulding-wheel circumference by a cover 4 which consists of an endless rotating moulding belt and which cooperates, in a sealing manner, with the moulding-wheel circumference with radial spacing from the moulding-wheel teeth 2 at each side of the moulding-wheel depression, to form a mould cavity. The beginning of the 2 GB 2 114 049 A mould cavity is closed, in a sealing manner, by a nozzle 5 which contains a runner 6 for the liquid 45 plastics material to be introduced and through which a reinforcing insert 7 in the form of wire is introduced, in a sealed manner, into the mould cavity. The under side of the nozzle 5, together with the moulding-wheel teeth 2, forms a gap through which a strip of fabric 8 is introduced into the mould cavity. Before being introduced into the mould cavity, the strip of fabric 8 is wetted with a liquid adhesive agent in an immersion bath 9 and then dried by means of a drying device 10. After the drying and hardening of the adhesive agent, the strip of fabric 8 is so stiff that it is guided laterally precisely in a straight line and lying flat and is laid on the moulding-wheel teeth 2 before the entry point of the plastics material and can be 60 introduced into the mould cavity. At first the grooves 3 between the moulding-wheel teeth are covered in a hollow manner by the stiff strip of fabric 8. As soon as the strip of fabric 8 meets the liquid plastics material introduced, at the circumference of the mould cavity, the adhesive agent becomes soft under the temperature acting and the strip of fabric 8 also becomes soft again and resiliently extensible in the longitudinal direction so that the plastics material introduced under pressure can press the strip of fabric 8 dowr into the grooves between the moulding-wheel teeth for the complete forming out of these grooves 3.
In order to increase the adhesive connection, for example, of metal wires as reinforcing inserts to the plastics materials usual for toothed belts, liquid adhesive agents are known and usual which are applied to the surface of the wire for example, by an immersion process, and hardened by drying and can be made soft again under the action of the processing temperature of the plastics material. Such adhesive agents can also be used for the method according to the invention for wetting and stiffening the resiliently extensible strip of fabric.

Claims (3)

1. A method of producing a toothed belt of plastics material or the like extrudable material with a reinforcing insert in the form of wire or thread extending in the longitudinal direction of the belt and with a fabric cover covering the toothed side of the belt, wherein a mould cavity is formed between a moulding wheel which can be driven continuously and which comprises, at its circumference, an annular depression which is profiled like a gear- wheel and corresponds in cross-section to the cross-section of the belt to be produced, and a cover closing the depression over a portion of the circumference of the moulding wheel, and the plasticized plastics material is introduced into the beginning of the mould cavity through a nozzle used for the sealed introduction of the reinforcing insert and/or the fabric cover, characterised in that a strip of fabric, which is resiliently extensible in its longitudinal direction, is wetted, in the substantially unextended state, with a liquid adhesive agent which enters into an adhesive connection with the plastics material and which is hardened by drying and softens again at the plasticizing temperature used for the introduction of the plastics material, and that, after the drying of the applied adhesive agent, the strip of fabric is introduced into the beginning of the mould cavity and laid on the teeth of the moulding-wheel depression and then made resiliently extensible by meeting the plastics material entering through the nozzle and heating and re-softening the adhesive agent, and is pressed into the grooves between the teeth in the moulding-wheel depression.
2. A method of producing a toothed belt of plastics material substantially as hereinbefore described with reference to the accompanying drawings.
3. Apparatus for producing a toothed belt of plastics material substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1983. Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained.
4
GB08237031A 1982-01-04 1982-12-31 Method of producing a reinforced toothed belt with fabric cover Expired GB2114049B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3200063A DE3200063C2 (en) 1982-01-04 1982-01-04 Process for the production of a reinforced toothed belt with a fabric cover

Publications (2)

Publication Number Publication Date
GB2114049A true GB2114049A (en) 1983-08-17
GB2114049B GB2114049B (en) 1985-06-05

Family

ID=6152601

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08237031A Expired GB2114049B (en) 1982-01-04 1982-12-31 Method of producing a reinforced toothed belt with fabric cover

Country Status (7)

Country Link
US (1) US4515743A (en)
JP (1) JPS58119835A (en)
CA (1) CA1200063A (en)
DE (1) DE3200063C2 (en)
FR (1) FR2519294B1 (en)
GB (1) GB2114049B (en)
IT (1) IT1159800B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755334A (en) * 1984-06-08 1988-07-05 Bayer Aktiengesellschaft Process for the continuous production of articles or coatings with contours of complicated shape
WO2017017137A1 (en) * 2015-07-30 2017-02-02 Habasit Ag System and method for manufacturing flightless, monolithic belt

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0433861Y2 (en) * 1987-09-29 1992-08-13
JPH01167260U (en) * 1988-05-17 1989-11-24
DE3931480C2 (en) * 1989-09-21 1993-12-16 Breco Kunststoff Toothed belt made of elastomeric material for reversible toothed belt drives and process for its manufacture
JPH05137798A (en) * 1991-11-21 1993-06-01 Takae Yamamoto Far infrared radiating body haying metallic germanium projecting part
AU673676B2 (en) * 1992-06-09 1996-11-21 Raychem Limited Insulators
US5837085A (en) * 1996-04-16 1998-11-17 Industrial Technology Research Institute Method of making a toothed belt with a reinforced fabric covering
DE10059067A1 (en) * 2000-11-28 2002-06-06 Peter Baeumler Method and device for manufacturing toothed belt molds and gear wheels
DE10206510B4 (en) * 2002-02-16 2004-02-12 Breco Antriebstechnik Breher Gmbh & Co. Method and device for manufacturing a toothed belt
DE102005056374B4 (en) * 2005-11-24 2017-05-24 Krones Aktiengesellschaft Belt for transporting vessels and method for manufacturing a belt
US20080047656A1 (en) * 2006-08-28 2008-02-28 Gerhard Hans Fickenwirth Method of manufacturing a belt
DE102009012395A1 (en) * 2009-03-10 2010-09-16 Siegfried Reichenbach toothed belt
KR20160088949A (en) 2011-12-14 2016-07-26 게이츠 코포레이션 System and method of making open-ended thermoplastic belting
US9676555B2 (en) * 2015-04-17 2017-06-13 F.N. Sheppard & Company Co-formed conveyor belt apparatus and process

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US3078206A (en) * 1959-02-25 1963-02-19 Us Rubber Co Method of forming belt teeth in reinforced positive drive belts
DE1291473B (en) * 1961-12-21 1969-03-27 Mueller Wilhelm H & Co Kg Process for the manufacture of belts intended for the manufacture of toothed drive belts
NL131619C (en) * 1964-11-16
US3436447A (en) * 1966-04-19 1969-04-01 Stauffer Chemical Co Manufacture of reinforced plastic sleeving and the like
GB1227191A (en) * 1967-05-31 1971-04-07
US3973894A (en) * 1970-11-02 1976-08-10 Continental Gummi-Werke Aktiengesellschaft Device for the production of toothed belts
GB1356504A (en) * 1971-05-14 1974-06-12 Breco Kunststoff Process and apparatus for continuous production of strips of plastics and like material containing a tension-resistant insert
US3999914A (en) * 1971-05-14 1976-12-28 Breco Kunststoffverarbeitungs-Gmbh & Co. Kg Device for producing in a continuous manner reinforced profile belts from extruded material
US4053547A (en) * 1971-10-14 1977-10-11 The Gates Rubber Company Method for producing a positive drive belt
US3956056A (en) * 1972-11-20 1976-05-11 Uniroyal Inc. Fabric coating by extrusion die-calendering apparatus and method
DE2504720A1 (en) * 1975-02-05 1976-08-19 Continental Gummi Werke Ag Toothed plastics driving belts prodn. - using helically wound reinforcing plastics coated cords located in mould
DE2526691C3 (en) * 1975-06-14 1979-06-07 Breco Kunststoffverarbeitungs-Gmbh & Co Kg, 4952 Porta Westfalica Method and device for the continuous production of endless drive belts with any circumferential length
US3981206A (en) * 1975-08-20 1976-09-21 Dayco Corporation Endless power transmission belt
JPS5415701A (en) * 1977-06-27 1979-02-05 Tadashi Iwazawa Cartridge
DE2801604C3 (en) * 1978-01-14 1980-10-02 Breco Kunststoffverarbeitungs-Gmbh & Co Kg, 4952 Porta Westfalica Process for the production of a reinforced endless toothed belt with a fabric cover
GB2065016B (en) * 1979-12-06 1983-02-23 Rolls Royce Moulding reinforced resin articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755334A (en) * 1984-06-08 1988-07-05 Bayer Aktiengesellschaft Process for the continuous production of articles or coatings with contours of complicated shape
WO2017017137A1 (en) * 2015-07-30 2017-02-02 Habasit Ag System and method for manufacturing flightless, monolithic belt

Also Published As

Publication number Publication date
FR2519294A1 (en) 1983-07-08
JPS6215350B2 (en) 1987-04-07
CA1200063A (en) 1986-02-04
DE3200063C2 (en) 1984-06-28
FR2519294B1 (en) 1987-09-18
IT8319002A0 (en) 1983-01-03
IT1159800B (en) 1987-03-04
US4515743A (en) 1985-05-07
GB2114049B (en) 1985-06-05
JPS58119835A (en) 1983-07-16
DE3200063A1 (en) 1983-07-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20011231